Follow -on dc -to -ac converter phase detector

The utility model discloses a follow -on dc -to -ac converter phase detector, including the first adder who connects gradually, the normally open contact of the rela, SOGI module and filter module, the SOGI module includes main line and repayment circuit, the main line includes consecutive second adder, first multiplier, first integrator, the repayment circuit is including the second integrator and the second multiplier that connect gradually, the output of first integrator is connected to the second integrator, second adder is connected to the relay, filter module is including the third adderthat connects gradually, the fourth adder, the third multiplier, the third integral ware, the output of third integral ware passes through line connection third adder, second adder and fourth adder are connected respectively to the second multiplier, first multiplier, the second multiplier, the third multiplier is input phase angle setting value respectively. The utility model discloses a dc -to-ac converter phase detect